There are a lot of people with those issues using the GTX 970 - so do i. Every game runs perfectly fine, high-ultra settings. CS:GO frames vary between 150-299.
I've read updating the Realtek audio drivers fixes the problem sometimes, but not for me. You could give it a try.

Have you turned off sync?
You should also go back to privacy guard - advanced, and disable keep awake for android os. Also check what has been executed many times.
I've noticed that my idle drain in wifi mode is much higher than it is in mobile data, you too?